Role of Polymer Stabilization in Governing Oxytetracycline Adsorption on Graphene Oxide
الموضوعات : PolymerFarand Farzi 1 , Karim Zare 2 , Omid Moradi 3 , Kambiz Larijani 4
1 - Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 - Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran
3 - Department of Chemistry, Shahr-e-Qods Branch, Islamic Azad University, Tehran, Iran
4 - Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran
الکلمات المفتاحية: Graphene oxide, Polymer stabilization, Oxytetracycline, Adsorption behavior, Metal-free adsorbent,
ملخص المقالة :
Oxytetracycline (OTC) is a widely used antibiotic that can persist in aquatic environments and raise environmental concerns. In this work, a graphene oxide/methyl methacrylate (GO/MMA) nanocomposite was synthesized via radical polymerization to explore how polymer stabilization influences the adsorption behavior of OTC on graphene oxide. The presence of the polymer matrix contributed to improved structural stability of GO and affected its interaction with OTC molecules.Adsorption experiments were carried out under optimized conditions, including pH 7.5, an adsorbent dosage of 0.3 g per 100 mL, an initial OTC concentration of 40 mg L⁻¹, a contact time of 90 min, and a temperature of 25 °C. Kinetic analysis showed that the adsorption followed a pseudo-second-order model (R² = 0.995), while equilibrium data were best described by the Langmuir isotherm, yielding a maximum adsorption capacity of 96 mg g⁻¹ and indicating monolayer adsorption.Thermodynamic evaluation revealed that the adsorption process was spontaneous (ΔG° = –3.8 to –5.1 kJ mol⁻¹) and endothermic (ΔH° = +18.7 kJ mol⁻¹), accompanied by a positive entropy change (ΔS° = +52.3 J mol⁻¹ K⁻¹). The adsorption mechanism involved π–π interactions, hydrogen bonding, and electrostatic attractions between OTC and the polymer-stabilized GO surface. In addition, the GO/MMA nanocomposite retained approximately 85% of its initial adsorption capacity after five reuse cycles, demonstrating the beneficial role of polymer stabilization in developing stable, metal-free graphene based adsorbents for antibiotic removal from water.
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